GMAT club

The GMAT club tests are precisely what they claim to be... the hardest quant tests in the market. However they are very useful because each question has brilliant explanations from bunuel and the gmatclub community. The tests are best used in the 'middle phase' of prep when you've completed all the concepts but do not want to finish the official tests just yet. The analytics are detailed and should be used to make a customized study plan and eliminate weaknesses. Your score on these tests may not accurately indicate what you might score on the actual exam since they are much tougher. However the more important thing with the tests is reviewing and learning from your mistakes and learning the traps employed by the GMAT